超声振动改善气体介质电火花加工的机理研究

提出了超声振动-气体介质电火花复合加工技术,在简述其加工原理的基础上分析了超声振动在改善气体介质电火花加工中的作用,以及相关的理论机理。实验结果表明,附加超声振动能改善放电间隙状态,减少短路、拉弧现象,提高了材料的去除率。进行了超声振动-气体介质电火花加工单脉冲实验设计。     

超声振动辅助气体介质电火花加工硬质合金表面裂纹特性

提出了超声振动辅助气体介质电火花加工技术并简述了其加工原理。用自行研制的实验机床对硬质合金进行了加工实验,通过观察加工表面微观形貌以及显微裂纹,简单分析了超声振动-气体介质电火花加工硬质合金表面裂纹的形成及扩展机理。     

超声振动辅助气体介质电火花加工实验机床的设计

提出了工具电极超声振动辅助气体介质电火花加工方法。设计了超声振动辅助气体介质电火花加工实验机床。实验结果表明,该机床能够满足超声振动辅助气体介质电火花加工的要求。     

电火花复合加工原理及应用

介绍了电火花复合加工是在电火花加工基础上产生和发展起来的.通过对电火花加工、超声波电火花加工、超声振动辅助气中放电加工原理和特点的比较,指出了超声振动辅助气中放电加工技术应用前景,以及电火花复合加工的发展趋势.     

超声振动辅助气体介质电火花加工研究

简述了超声振动辅助气体介质电火花加工原理，并设计开发了相应的实验机床。实验结果表明：工具电极做超声振动时的材料去除率比工件做超声振动时的材料去除率要小；材料去除率随峰值电压、峰值电流、脉冲宽度、气体介质压力的增大而增大，随脉间宽度、工具电极壁厚的增大而减小。简述了超声振动辅助气体介质电火花加工材料蚀除机理。     

基于Fluent的超声振动-气体介质电火花加工气体流场模拟

简述了超声振动-气体介质电火花加工的基本原理,建立了加工过程气体流场模型。并用Fluent有限元分析软件对气体流场进行了模拟,分析了气体压力、加工深度、放电间隙的变化对气体流速的影响。     

超声振动辅助磨削脉冲放电复合加工工艺研究

利用超声振动、电火花脉冲放电的加工特点,将其同单一普通磨削优化组合,可以得到较好的加工效果.从加工表面粗糙度、表面微观形貌两个方面,比较了单一磨削、超声振动辅助磨削、磨削-电火花脉冲放电复合加工、超声振动辅助磨削-电火花脉冲放电复合加工的加工效果,得出了不同加工方法的优缺点.通过对几种加工方法的优化组合,设计了新的加工工艺.实验结果证明,新的加工工艺可以有效地提高加工表面质量,减少裂纹和热应力的产生.     

工件超声振动电火花线切割复合加工试验研究

借助ANSYS软件对变幅杆、夹具和工件进行整体的动力学研究,设计了一套超声振动电火花线切割复合加工装置。在相同加工参数下,分别采用工件超声振动电火花线切割复合加工和传统的电火花线切割加工对45钢进行切割试验。试验结果表明:与传统的电火花线切割加工相比,超声振动电火花线切割复合加工的效率提高了约15%,表面粗糙度减小了约10%。     

超声振动辅助气中放电加工的产生及应用

超声振动辅助气中放电加工是在电火花加工、超声电火花复合加工的基础上产生和发展起来的，通过他们之间加工特点的比较，重点研究了超声振动辅助气中放电加工的基本原理和特点，以指导超声振动辅助气中放电加工技术的应用，并促进其发展。     

超声复合特种加工技术的研究及其发展趋势

简要介绍以超声振动为辅助,电解、电火花以及激光加工为主的复合加工技术,分析其加工机理、优势及应用,并展望未来超声复合加工技术的发展趋势。     

Analytical and experimental study on the integration of ultrasonically vibrated tool into the micro electro-chemical discharge drilling

Electrochemical discharge machining (ECDM) is a non-traditional machining process which is used to create micro-features on non-conductive materials. Micro holes and micro channels are the most interested features that have been fabricated by researchers. In recent years, some technical augmentations have been added to the ECDM process to achieve a more efficient machining process, but the employment of each augmentation in the most efficient way is not subjected. In this research, ultrasonic vibration is concentrated on the tool tip which directly and continuously effects on the machining zone and avoids global undesirable effects. For this purpose, modal analysis is used to design a special configuration which achieves the maximum amplitude of vibration in the tool tip. Also, an analytical model is presented for both of the electro-chemical discharge machining (ECDM) and ultrasonic assisted electro-chemical discharge machining (UAECDM) to study the effect of ultrasonic vibration on the thickness of gas film. Practical gas film thickness, machining speed, entrance overcut and tapering zone are studied for both of the ECDM and UAECDM to comprehensive understanding the effect of integration of ultrasonic vibration into the traditional ECDM process. Captures of gas film in different condition confirmed that ultrasonic vibration has reduced the thickness of gas film. Same behavior was achieved by employment of the analytical modeling. As a result, numerous small discharges were achieved which increased the material removal rate (MRR) and hole accuracy, simultaneously. Results showed that ultrasonic vibration can increase MRR up to 82%. Also, tapering zone and entrance overcut deviation as accuracy parameters improved 50% and 40%, respectively.     

基于ANSYS的超声振动辅助气中放电加工材料去除率计算

建立了超声振动辅助气中放电加工的有限元模型,使用ANSYS分析软件对其温度场进行了数值模拟,计算出了仿真条件下的材料去除率,并通过加工试验验证了模拟结果,发现与试验结果吻合较好。结果表明,用ANSYS来计算超声振动辅助气中放电加工的材料去除率是一种行之有效的方法。     

Effect of ultrasonic vibration of tool on electrical discharge machining of cemented tungsten carbide (WC-Co)

This paper deals with the effect of copper tool vibration with ultrasonic (US) frequency on the electrical discharge machining (EDM) characteristics of cemented tungsten carbide (WC-Co). It was found that ultrasonic vibration of the tool (USVT) was more effective in attaining a high material removal rate (MRR) when working under low discharge currents and low pulse times (finishing regimes). In general, the surface roughness and the tool wear ratio (TWR) were increased when ultrasonic vibration was employed. It was observed that application of ultrasonic vibration significantly reduced arcing and open circuit pulses, and the stability of the process had a remarkable improvement. This study showed that, there were optimum conditions for ultrasonic assisted machining of cemented tungsten carbide, although the conditions may vary by giving other input parameters for those which had been set constant in the present work.     

超声振动辅助电火花脉冲放电表面强化层表面质量研究

采用超声振动辅助电火花脉冲放电表面强化技术进行了65Mn钢表面硅电极表面强化.设计了工具电极超声振动辅助电火花脉冲放电表面强化机床;研究了超声振幅和频率对强化层表面粗糙度、表面和截面形貌、Si含量及相结构的影响规律.研究表明,选择合适的超声振幅和频率,可以提高强化层的表面粗糙度,改善强化层的表面形貌,使强化层厚度分布更...     

超声振动辅助混粉电火花表面强化粗糙度研究

进行超声振动辅助混粉电火花表面强化实验,分析超声振动辅助混粉电火花表面强化过程中各因素,例如脉宽、脉间、峰值电流、混粉浓度和超声振动振幅等对强化层表面粗糙度的影响规律,研究结果表明,各因素对强化层表面粗糙度影响规律明显,研究结果可以对超声振动辅助混粉电火花表面强化的工艺参数优化提供依据,对进一步的理论和实验研究具有一定的指导意义.